Defect-Induced Epitaxial Growth for Efficient Solar Hydrogen Production

Kan Zhang, Jung Kyu Kim, Bumsu Park, Shifeng Qian, Bingjun Jin, Xiaowei Sheng, Haibo Zeng, Hyunjung Shin, Sang Ho Oh, Chang Lyoul Lee, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Epitaxial growth suffers from the mismatches in lattice and dangling bonds arising from different crystal structures or unit cell parameters. Here, we demonstrate the epitaxial growth of 2D MoS2 ribbon on 1D CdS nanowires (NWs) via surface and subsurface defects. The interstitial Cd0 in the (1210) crystal plane of the [0001]-oriented CdS NWs are found to serve as nucleation sites for interatomically bonded [001]-oriented MoS2, where the perfect lattice match (∼99.7%) between the (1011) plane of CdS and the (002)-faceted in-plane MoS2 result in coaxial MoS2 ribbon/CdS NWs heterojunction. The coaxial but heterotropic epitaxial MoS2 ribbon on the surface of CdS NWs induces delocalized interface states that facilitate charge transport and the reduced surface state. A less than 5-fold ribbon width of MoS2 as hydrogen evolution cocatalyst exhibits a ∼10-fold H2 evolution enhancement than state of the art Pt in an acidic electrolyte, and apparent quantum yields of 79.7% at 420 nm, 53.1% at 450 nm, and 9.67% at 520 nm, respectively.

Original languageEnglish
Pages (from-to)6676-6683
Number of pages8
JournalNano letters
Volume17
Issue number11
DOIs
Publication statusPublished - 2017 Nov 8

Bibliographical note

Funding Information:
This work was mainly supported by Samsung Science and Technology Foundation (SRFC-MA1502-09). Professor X. Sheng thanks the National Natural Science Foundation of China (No. 11404006). For financial support, Dr C.-L. Lee thanks the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2016R1A2B4013003) and GIST Research Institute (GRI).

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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